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New CM40 extractor problem

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  • #1

    New CM40 extractor problem

    Hello. New guy here with a new CM40. Having failure to feed issues. I did go through all of the new Kahr tips and have followed all of the advise for breaking in a new gun. Just for the record I am not at all new to guns or small 40's. I am not limp wristing and have tried 2 other shooters just to make sure. Yesterday I got to the 300 round mark and the gun has not improved. I average 3 to 5 failures to feed per 50. I have tried 4 different brands of ammo. I did notice after reading 100 percents thread that my extractor tension is very high. All brass is scarred from the extractor in the same way. I guess my question is, is there a way to "Tune" the tension on these extractors?
    Thanks for any help.
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  • #2
    Failure to feed

    I doubt if it is going to fix itself. I tested the extractor by pushing brass up through the slide without the barrel in it of course. It was way tougher to do than in other similar guns. The brass is tipped up a bit as it starts into the extractor.

    I took out the extractor, it was beveled at the bottom, but not smooth enough. The edge was sharp enough to dig into the rim of the brass. I radiused the edge on a stone.

    I lived with this gun for nearly 4 years giving me intermittent FTFs. I bought it used and figured that it would break in.

    muggsy posted the tip recently.
    “If someone has a gun and is trying to kill you, it would be reasonable to shoot back with your own gun.”

    ― Dalai Lama XIV (as told to high school students.)

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    • #3
      Here is a pic of the installed extractor looking down the slide. Note the radiused shape at the bottom of the extractor. I thinned it from behind a bit too.
      “If someone has a gun and is trying to kill you, it would be reasonable to shoot back with your own gun.”

      ― Dalai Lama XIV (as told to high school students.)

      Comment

      • #4
        anutter thing many do with the extractor is file off about .020 off the end of the long rod that goes in the extractor channel. This seems to loosen up the extractor a tad, for if u test kahrs extractor, it is one stout M**##ker.. Just sayin
        . My PM9 has over 34,000+ rounds through it, and runs much better than an illegal trying to get across our border


        NRA BENEFACTOR MEMBER


        MAY GOD BLESS MUGGSY

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        • #5
          Funny, what has changed on my weapon is that the brass pretty much goes very high over the right side of the my body.

          I didn't want to get a failure to extract and after polishing the spring ends and rod end on the extractor control rod, the brass was still very stiff getting started into the extractor. So I modified the extractor claw only at the bottom though.

          What ever works though.
          “If someone has a gun and is trying to kill you, it would be reasonable to shoot back with your own gun.”

          ― Dalai Lama XIV (as told to high school students.)

          Comment

          • #6
            Just what i was loooking for. Thanks for the replies.

            Comment

            • #7
              I had a lot of problems fixing my P40's FTF's... my rounds would catch at a 45° angle going into the chamber. The rounds would c0ck in the chamber and if I just took the slightest bit of pressure off the round by gripping the slide and starting to move it rearward, there would be a click and the round would pop up into place and chamber easily as I released the slide. I tried all kinds of polishing the chamber mouth before addressing the extractor. I tried sliding the cartridge up against the breechface to check the clearances and decided to radius the extractor surfaces that come into contact with the rim of the cartridge... problem solved.

              This problem took me weeks to solve. I... and others... thought it was a problem with the chamber. After many attempts to polish the chamber and repeated trips to the range for testing, I finally looked at the extractor.

              Link to that coverage in my "P40 Blog" back in 2011:

              Near last of pictures post #27 in the link.

              Wynn's Mag-Na-Ported P40 BLOG updated - Page 3 - KahrTalk Forums

              Wynn
              USAF Retired '88, NRA Life Member. Wife USAF Retired '96
              Avatar: Wynn re-enlists his wife Desiree, circa 1988 Loring AFB, ME. 42nd BMW, Heavy (SAC) B-52G's
              Frédéric Bastiat’s essay, The Law: http://mises.org/books/thelaw.pdf

              Thomas Jefferson said

              “A government big enough to give you everything you want, is strong enough to take everything you have.”
              and
              "Peace is that brief glorious moment in history when everybody stands around reloading".

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              • #8
                Hi Wynn. I skimmed through about 12 pages finding the fix. Do you think the porting was a factor in the tuning of your extractor problem. Did the problem start after the porting? I am thinking, decreased recoil energy....

                Have you installed heavier springs?

                Seems like this is a fairly common problem.

                I have a PPK that has never run right.
                “If someone has a gun and is trying to kill you, it would be reasonable to shoot back with your own gun.”

                ― Dalai Lama XIV (as told to high school students.)

                Comment

                • #9
                  Modified extractor as was done above by 100 percent. Took it out today to try it out. Got through 15 rounds and had the famous mag follower breakage. Not overly impressed with the quality control at Kahr thus far. They are sending me a new follower but as I have been reading it looks like I will either have to send gun back or modify the barrel myself to keep from having to get a new follower every week.

                  Comment

                  • #10
                    I've seen a lot of follower breakage. I thought is my PM40 going to have that.

                    I painted some silver magic marker all over the front of the black follower. there is one area that I see a bit of marking on the follower after running the mag a few times. I have had my gun since 2010 so I guess it isn't enough contact to break anything.

                    I am see a bit of a stress crack around the slide lock open metal pin embedded in the follower.
                    “If someone has a gun and is trying to kill you, it would be reasonable to shoot back with your own gun.”

                    ― Dalai Lama XIV (as told to high school students.)

                    Comment

                    • #11
                      Originally posted by 100percent View Post
                      Hi Wynn. I skimmed through about 12 pages finding the fix. Do you think the porting was a factor in the tuning of your extractor problem. Did the problem start after the porting? I am thinking, decreased recoil energy....

                      Have you installed heavier springs?

                      Seems like this is a fairly common problem.

                      I have a PPK that has never run right.
                      No, I don't think the porting was a factor. The springs are still original, but I have new Wolff ones if I feel the need. I think that there just wasn't enough clearance for the cartridge rims to ease into place smoothly.

                      I just posted that I'm putting the P40 back into use as my main EDC after a lot of testing and acquiring some more of my favorite SD ammo... 180-gr Speer Gold Dots, short barrel version.

                      Wynn
                      USAF Retired '88, NRA Life Member. Wife USAF Retired '96
                      Avatar: Wynn re-enlists his wife Desiree, circa 1988 Loring AFB, ME. 42nd BMW, Heavy (SAC) B-52G's
                      Frédéric Bastiat’s essay, The Law: http://mises.org/books/thelaw.pdf

                      Thomas Jefferson said

                      “A government big enough to give you everything you want, is strong enough to take everything you have.”
                      and
                      "Peace is that brief glorious moment in history when everybody stands around reloading".

                      Comment

                      • #12
                        I'm with wyn on this ojne. I have had ported guns for over 30 years, probalb y in all that time 15 semi's, never an issue, Porting should and would have no influenceon the issue that wy was having and he trouble shot the issue and fixed it himself. yahoo to wyn.

                        I love ported guns by Magna port.
                        . My PM9 has over 34,000+ rounds through it, and runs much better than an illegal trying to get across our border


                        NRA BENEFACTOR MEMBER


                        MAY GOD BLESS MUGGSY

                        Comment

                        • #13
                          Only cowboys can say yahoo Jocko, I'm not sure what sheep abusers say but I'm sure you'll think of something inappropriate.

                          Maybe it's an imitation of a back up buzzer on a truck.
                          http://bawanna45.wix.com/bawannas-grip-emporium#!
                          In Memory of Paul "Dietrich" Stines.
                          Dad: Say something nice to your cousin Shirley
                          Dietrich: For a fat girl you sure don't sweat much.
                          Cue sound of Head slap.

                          RIP Muggsy & TMan

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                          • #14
                            Hey firedude i to own a cm40 got it right after christmas and have just under 1000 threw it and have of.course had a few problems with but tthe ftf happebd mostley onchambering first roundt.it.was jam took the the.range one day.came back and cleaned it.using a.earcleaner i.relized it snaggged on something on the bullit channle sprry dont no technicle names oppsit of the extractor the.bullit wore a grove akd there was a burr.stickin out just.enouph to.touch the.bullit and.cause.a.problem very carefull filled.itdown gun runs just.flawless i.can.run hundreds.of rounds a session no problems broke.one follower at round 150 then havent broke one.since bought a.couple extra just incase.easyer that way

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                            • #15
                              Do you see my point. With the porting, some if not most of the energy is released at the port. In the 4 years I had a malfunctioning gun I didn't want to do anything to reduce the recoil. Now that it is running, I don't want to make it not run.

                              I wouldn't mind a smoother running gun, do I need more flash flaring up? Particularly my handloads seem to flash quite a bit.

                              - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                              Kahrtalk where information comes from the heart and head but has to be re-translated.
                              “If someone has a gun and is trying to kill you, it would be reasonable to shoot back with your own gun.”

                              ― Dalai Lama XIV (as told to high school students.)

                              Comment

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